hadoop2.6.0添加集群节点（二）

矫情吗；* 2022-01-26 00:23 164阅读 0赞

一、新节点操作系统配置（可以参考hadoop2.6.0三节点集群环境搭建（一））  
(1) 主机名更改

(2) Ip地址配置

(3) /etc/hosts文件配置

(4) Jdk安装

(5) /etc/hosts文件配置防火墙关闭

(6) Selinux关闭

(7) vm.swappiness参数配置

(8) 创建hadoop用户及目录

(9) 无密码登入

二、 更新所有节点的/etc/hosts

\[root@master training\]\# scp /etc/hosts slave1:/etc/

\[root@master training\]\# scp /etc/hosts slave2:/etc/

\[root@master training\]\# scp /etc/hosts hadoop04:/etc/

三、 无密码登入，即节点间信任关系

On hodoop04

su - hadoop

ssh-keygen -t rsa -P ''

cat .ssh/id\_rsa.pub >> .ssh/authorized\_keys

scp .ssh/id\_rsa.pub hadoop@master:/home/hadoop/id\_rsa\_04.pub

on master

su - hadoop

cat id\_rsa\_04.pub >> .ssh/authorized\_keys

scp .ssh/authorized\_keys hadoop@hadoop04:/home/hadoop/.ssh/authorized\_keys

四、 更改/opt目录的权限（将来用hadoop用户将主节点hadoop软件考到hadoop04节点）

\[root@hadoop04 training\]\# chmod 775 /opt

五、 拷贝hadoop家目录到hadoop04节点

On master

\[hadoop@master opt\]$ scp -r hadoop-2.6.0 hadoop04:/opt

创建链接

On hadoop04

\[hadoop@hadoop04 opt\]$ ln -s hadoop-2.6.0 hadoop

六、 更新hadoop04节点hadoop用户的环境变量

On master

\[hadoop@master ~\]$ scp /home/hadoop/.bash\_profile hadoop04:/home/hadoop/

七、 修改master节点的slaves文件

\[hadoop@master hadoop\]$ vi slaves

slave1

slave2

hadoop04

八、 Hadoop04节点启动datanode和nodemanager服务

\[hadoop@hadoop04 opt\]$ hadoop-daemon.sh start datanode

\[hadoop@hadoop04 opt\]$ jps

2631 DataNode

2691 Jps

\[hadoop@hadoop04 opt\]$ yarn-daemon.sh start nodemanager

\[hadoop@hadoop04 opt\]$ jps

2631 DataNode

2851 Jps

2755 NodeManager

\[hadoop@hadoop04 opt\]$

九、 查看集群状态

\[hadoop@master hadoop\]$ hdfs dfsadmin -report

Configured Capacity: 75593183232 (70.40 GB)  
Present Capacity: 55412535296 (51.61 GB)  
DFS Remaining: 55412412416 (51.61 GB)  
DFS Used: 122880 (120 KB)  
DFS Used%: 0.00%  
Under replicated blocks: 0  
Blocks with corrupt replicas: 0  
Missing blocks: 0

\-------------------------------------------------  
Live datanodes (3):                《=====有三个datanode节点，说明添加成功

Name: 192.168.123.11:50010 (slave1)  
Hostname: slave1  
Decommission Status : Normal  
Configured Capacity: 25197727744 (23.47 GB)  
DFS Used: 49152 (48 KB)  
Non DFS Used: 6726680576 (6.26 GB)  
DFS Remaining: 18470998016 (17.20 GB)  
DFS Used%: 0.00%  
DFS Remaining%: 73.30%  
Configured Cache Capacity: 0 (0 B)  
Cache Used: 0 (0 B)  
Cache Remaining: 0 (0 B)  
Cache Used%: 100.00%  
Cache Remaining%: 0.00%  
Xceivers: 1  
Last contact: Thu Mar 16 23:23:20 EDT 2017

Name: 192.168.123.13:50010 (hadoop04)    《====新添加的节点  
Hostname: hadoop04  
Decommission Status : Normal  
Configured Capacity: 25197727744 (23.47 GB)  
DFS Used: 24576 (24 KB)  
Non DFS Used: 6727045120 (6.27 GB)  
DFS Remaining: 18470658048 (17.20 GB)  
DFS Used%: 0.00%  
DFS Remaining%: 73.30%  
Configured Cache Capacity: 0 (0 B)  
Cache Used: 0 (0 B)  
Cache Remaining: 0 (0 B)  
Cache Used%: 100.00%  
Cache Remaining%: 0.00%  
Xceivers: 1  
Last contact: Thu Mar 16 23:23:20 EDT 2017

Name: 192.168.123.12:50010 (slave2)  
Hostname: slave2  
Decommission Status : Normal  
Configured Capacity: 25197727744 (23.47 GB)  
DFS Used: 49152 (48 KB)  
Non DFS Used: 6726922240 (6.26 GB)  
DFS Remaining: 18470756352 (17.20 GB)  
DFS Used%: 0.00%  
DFS Remaining%: 73.30%  
Configured Cache Capacity: 0 (0 B)  
Cache Used: 0 (0 B)  
Cache Remaining: 0 (0 B)  
Cache Used%: 100.00%  
Cache Remaining%: 0.00%  
Xceivers: 1  
Last contact: Thu Mar 16 23:23:20 EDT 2017

节点刷新

On master

\[hadoop@master hadoop\]$ yarn rmadmin –refreshNodes

负载均衡

\[hadoop@master hadoop\]$ hdfs balancer --help  
Usage: java Balancer  
        \[-policy <policy>\]      the balancing policy: datanode or blockpool  
        \[-threshold <threshold>\]        Percentage of disk capacity  
        \[-exclude \[-f <hosts-file> | comma-sperated list of hosts\]\]     Excludes the specified datanodes.  
        \[-include \[-f <hosts-file> | comma-sperated list of hosts\]\]     Includes only the specified datanodes.

Generic options supported are  
\-conf <configuration file>     specify an application configuration file  
\-D <property=value>            use value for given property  
\-fs <local|namenode:port>      specify a namenode  
\-jt <local|resourcemanager:port>    specify a ResourceManager  
\-files <comma separated list of files>    specify comma separated files to be copied to the map reduce cluster  
\-libjars <comma separated list of jars>    specify comma separated jar files to include in the classpath.  
\-archives <comma separated list of archives>    specify comma separated archives to be unarchived on the compute machines.

The general command line syntax is  
bin/hadoop command \[genericOptions\] \[commandOptions\]

\[hadoop@master hadoop\]$ start-balancer.sh -threshold 5  
默认值是10%,这个值越小，集群数据分布越平均  
\---------------------   
作者：forever19870418   
来源：CSDN   
原文：https://blog.csdn.net/forever19870418/article/details/62887072   
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